I am currently working on this scene, but I am not sure how to make the scene better.:yes: All criticism is welcome :yes:
<img src="/uploads/default/original/4X/a/b/7/ab725f95eaaa0943e6b7ac33d55266dd94cd0598.jpg" width="690" height="362"><br/>Hard to point something specific. I think your problem is materials on almost all surfaces, currently overall look is very very CG. Maybe try to work with glass material (fake it if necessary), also some variance in colors for leaves in trees. Scatter some autumn leaves on ground (looks like it’s appropriate season).
All render engines doing light calculations very precise - like in real world, but allways remember that visuals must look nice - not physically correct 
If it just looks not right for your eye - fake it (lights, reflections etc).
I would start with the grass, which is the most unnaturally uniform. The lighting angle is that of dawn or dusk, but the lighting color and sky texture don’t match. Aiduss had a couple other good points. Keep at it, it’s coming along!